134 Scott and Maslen . — The Structure of Trig onocar pus . 
Fig. 21. More tangential section of the same seed passing through a longitudinal ridge of the 
sclerotesta on one side. Slide S. 28, d. (O). Magnification 6£. 
s.t. sclerotesta ; c. cavity of seed. 
Fig. 22. Still more tangential section of the same seed showing the sharply angular form of the 
ridges. Slide S. 28 a. (O). Magnification 6|. 
s.t. sclerotesta ; c. trace of cavity of seed. 
PLATE XIV. 
Trigonocarpus Parkinsoni. 
Fig. 23. The limiting layers of the sarcotesta. Slide R. 763 (M). Magnification about 40. 
e. epidermis of small cells ; h. hypodermis of larger cells with dark contents ; sa. ordinary cells 
of the sarcotesta. 
Fig. 24. Lacunar tissue of the outer part of the sarcotesta. Slide 1459 (W). Magnification 
about 45. 
Fig. 25. Sarcotestal bundles at base of seed. Same slide as PI. XII, Fig. 12. Slide R. 763 (M). 
Magnification about 80. 
sa. cells of sarcotesta; b ., b., b. vascular bundles; s.t. short tracheides (transfusion elements) in 
delicate tissue between the bundles ; a. other short tracheides among cells of sarcotesta ; h. hypodermal 
cells of sarcotesta (displaced). 
Fig. 26. Types of tracheides from the sarcotestal bundles shown in Fig. 25. Slide R. 763 (M). 
A. Commonest type of tracheide with very fine spiral or scalariform markings. Magnification 
about 280. 
B. One of the small elements (protoxylem) from the central part of a bundle. Magnification 
about 460. 
C. Tracheide with two series of crossing spiral bands. Magnification about 280. 
D. Oblique view of a scalariform tracheide. 
Fig. 27. Two short tracheides (transfusion elements) from the same slide. Slide, R. 763 (M). 
Magnification 560. 
Fig. 28. A sarcotestal bundle. Apparently mesarch. The position of this bundle is shown in 
PI. XI, Fig. 5, s.b. Slide 325 (S). Magnification 200. 
sa. cells of sarcotesta ; d.t. decomposed tissue. The arrow points towards the outside of 
the seed. 
Fig. 29. Portion of the nucellus showing the nucellar epidermis. Slide 4(0). Magnification 560. 
n.e. nucellar epidermis ; c.e. separated cuticle of epidermal cells ; i.e. inner tissue of nucellus. 
Fig* 3 °* Part of a transverse section of the nucellus showing a nucellar bundle. Slide R. 762 (M). 
Magnification 170. 
n.b. flattened nucellar bundle ; i. intermediate layers of nucellus ; n.e. remains of nucellar 
epidermis. 
Fig. 31. Another part of the same transverse section. Slide R. 762 (M). Magnification 160. 
n.b . part of flattened nucellar bundle ; t. tracheide in longitudinal section ; i. intermediate 
layers of nucellus consisting of flattened cells ; c.e. contracted contents of epidermal cells ; e. cuticle 
of epidermal cells. 
Fig. 32. A part of the pollen-chamber beak shown in PL XII, Fig. 14. Slide 224 (B). 
Magnification 400. 
iv. wall of beak consisting of a palisade-like tissue ; t. possible tracheides. 
